Double-drum winch

Abstract

A double-drum winch having a single power transmission train for both a hook drum and a boom drum. The power transmission train comprises a high speed clutch and a low speed clutch mounted on a single first clutch shaft which is in turn mounted for rotation on a winch frame, a hook lowering clutch and a boom lowering clutch mounted on a single second clutch shaft which is in turn rotatably mounted on the frame, and a hook hoisting clutch and a boom hoisting clutch mounted on a single third clutch shaft which is in turn rotatably mounted on the frame, the second clutch shaft being located between the first and third clutch shafts and engageable with both the clutch shafts. The power transmission train is connected with the hook drum and the boom drum via a hook brake shaft and a boom brake shaft, respectively.

What is claimed is: 
     
       1. A double-drum winch having a hook drum and a boom drum mounted therein comprising a winch frame; prime mover means fixedly mounted on said frame;   a drive shaft rotatably mounted on said frame, said drive shaft being connected with and rotated by said prime mover means;   a first clutch shaft rotatably mounted on said frame, said first clutch shaft having a first gear fixedly secured thereon, a high speed clutch mounted thereon and a low speed clutch mounted thereon, said high and low speed clutches being mounted oppositely relative to said first gear;   a second clutch shaft rotatably mounted on said frame, said second clutch shaft having a second gear engageable with said first gear fixedly mounted thereon, a hook lowering clutch mounted thereon and a boom lowering clutch mounted thereon, said hook and boom lowering clutches being mounted oppositely relative to said second gear;   a third clutch shaft rotatably mounted on said frame, said third clutch shaft having a third gear engageable with said second gear fixedly mounted thereon, a hook hoisting clutch mounted thereon and a boom hoisting clutch mounted thereon, said hook and boom hoisting clutches being mounted oppositely relative to said third gear;   a hook brake shaft rotatably mounted on said frame, said hook brake shaft having hook brake means mounted thereon and being selectively connectible for rotation with said second and third clutch shafts;   a boom brake shaft rotatably mounted on said frame, said boom brake shaft having boom brake means mounted thereon and being selectively connectible for rotation with said second and third clutch shafts; and   a drum shaft fixedly mounted on said frame, said drum shaft having the hook drum and the boom drum rotatably mounted thereon, said hook drum being connected with said hook brake shaft and said boom drum being connected with said boom brake shaft.   
     
     
       2. A double-drum winch as defined in claim 1 wherein said high and low speed clutches are alternately engageable and wherein the input sides of said high and low speed clutches are connected for rotation with said drive shaft, and the output sides thereof are fixedly mounted on said first clutch shaft. 
     
     
       3. A double-drum winch as defined in claim 2 wherein the input sides of said hook and boom lowering clutches are fixedly mounted on said second clutch shaft and wherein the input sides of said hook and boom hoisting clutches are fixedly mounted on said third clutch shaft. 
     
     
       4. A double-drum winch as defined in claim 1, 2 or 3 wherein said hook and boom brake means comprise disc brakes.